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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >On the Development of Coherent Structure in a Plane Jet: Part 4, The Multipoint Simultaneous Measurement of Two-Component Velocities and the Simple Coherent Structure Model
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On the Development of Coherent Structure in a Plane Jet: Part 4, The Multipoint Simultaneous Measurement of Two-Component Velocities and the Simple Coherent Structure Model

机译：平面射流中相干结构的发展：第4部分，双分量速度的多点同时测​​量和简单相干结构模型

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摘要

To clarify the large-scale coherent structure in a turbulent plane jet, the simultaneous measurement of the main streamwise and the cross-streamwise velocity at 9 points in the self-preserving region of a turbulent plane jet has been performed using an array of X-type hot-wire probes. From the time variation of the main streamwise fluctuating velocity field, it is found that there exists a pair of fluid lumps with the positive and negative fluctuating velocity on opposite sides of the jet centerline. On the other hand, the instantaneous cross-streamwise fluctuating velocity shows the same sign over the cross section; i.e., a vertically striped pattern is formed. On the basis of the result of the Karhunen-Loeve (KL) expansion, a new interpretation of the coherent structure model in the self-preserving region of a turbulent plane jet has been given from the combination of "flapping" and "puffing".
机译：为了阐明湍流平面射流中的大规模相干结构，已使用X-射线阵列同时测量了湍流平面射流自保持区域中9个点的主流速度和横向流速度型热线探针。从主要的脉动脉动速度场的时间变化，发现在射流中心线的相对两侧存在一对具有正负脉动速度的流体团块。另一方面，瞬时横流脉动速度在横截面上显示相同的符号。即，形成垂直条纹图案。根据Karhunen-Loeve（KL）扩展的结果，通过“拍打”和“吹气”的组合，对湍流平面射流的自保持区域中的相干结构模型进行了新的解释。

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